Vandbrobertson wrote:

Don't plan on cool at altitude!
A Glastar pilot with a Suburu 2.5 liter reported 90 deg. F at 10000 ft going
home from
Oshkosh. Water temp exceeded 240 deg at that altitude.

Vince robertson

And he kept flying with his water temp at 240 deg F?
It is not unusual to get high temps at altitude out
here in the west.

BTW Sounds like his rad ducting  or some other
part(s) of his cooling system were improperly designed. Got any pictures?

Paul Lamar

Bill Freeman wrote:

Interesting.  I went to 10.5K on the way home and (as usual) had
to run the heater.  Seems like it was 50F OAT or so, IIRC.

Bill

It is those 10K mountains Bill.

Paul Lamar
 
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